Concrete tie



Jan. 30, 1923.

R. K. 0. SAHLBERG.

CONCRETE [lE. FILED JUNE 19. 1922.

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tion.

Patented Jan. 30, 1923.

warren snares mea er ROLF KARL OSKAB SAHLBEEG, OF STOCKHOLIVI, SWEDEN.

CONCRETE TIE.

Application filed June 19, 1922. Serial No. 569,563.

To all "whom it may concern:

Be it known that I, ROLF KARL Osman SAHLBERG, citizen of Sweden, residing at Stockholm, Sweden, have vinvented certain new and useful Improvements in Concrete Ties, of which the following is a specifica- This invention relates to railroad ties and particularly to ties which are of concrete construction.

The primary object of my invention is the ing portions are secured together with an integral connecting brace portion.

Another object of my invention is the provision of an improved railroad tie of concrete wherein the rail supporting portions are integral with each other and are provided with cupped portions beneath the rail supporting portions whereby the side thrusts upon the ties, as when ties are placed on curves, will be taken up by a direct thrust upon the earth.

Another and further object of my invention is the provision of a reinforced concrete railroad tie which will be of minimum weight for the amount of load required to be carried. 7

Referring to the drawing wherein a preferred embodiment of my invention is illustrated,

Figure 1 illustrates an elevation of my improved railroad tie showing a portion in section,

Figure 2 is a plan view of my improved tie showing the web of the connecting portion in dotted lines, 7

Figure 3 is a cross sectional view on the line 3-3 of Figure 2,

Figure 4 is a cross sectional View on the line 4-4 of Figure 1. I,

The same reference characters "refer to similar parts throughout the views.

10, 10 designate the hollow shell portions of the tie, there being one arranged at each end of the tie. These hollow shell portions 10 have flattened outer rims 11, 11 respectively which bear upon the ground and take the greater portion of the vertical forces of reaction from the ground when the weight of the train is borne by the tie. The sides 12, 12*, as illustrated in the right half of Fi ure 1 when the tie is in the round or buried in ballast, act to take the reaction from .the. ground when there is a .side

thrust due tothecentrifugal force of the train when roundinga curve.

The hollow cup. portion 10, 10 preferably .are elliptical in plan and have their longer axes extending in the direction of the longitudinal axis of the tie as a whole.

In order to support the outer edge of the cup portions 10, 10 and prevent spreading of the flattened rims 11, 11, I have provided reinforcing rings 13, 13 preferably having an angular cross section, as shown in Figure 3.

Between the-cup portions 10 and 10 is an integral connecting brace of T-shaped cross section as clearly shown in Figure 4:. The upper flange portion 15 of the brace is preferably reinforced by rods 16 having bent up portions 17, 17 with bent down ends 18, 18. The web 19 of the T-portion is also provided with a reinforcing rod 20 having up-turned ends 21, 21'. I

The T-shaped connecting brace acts as a separating and reinforcing means for the two rail supporting cup members 10, 10"v and because of its position between the two rail supporting cup members has an upward reaction at its middle from the ground and a downward load at each end, due to the weight of the train. For this reason, the upper portion is reinforced more than the lower portion and is also of greater cross section. This shape is particularly advantageous, due to the fact that concrete has a much greater strength in compression, as

at the bottom of the web, than in tension, as at the top. I

It will be noted that this construction affords a maximum amount of strength with a minimum amount of material. The proportions would, of course, be such as to conform to the load to be carried.

At the top of each cup portion 10, 10 are flat surfaces, 22, 22* upon which rest the rails. These surfaces 22, 22 above the brace portion 19 and are surrounded by the reinforcing rings 23, 23', respectively. These reinforcing rings'23, 23, provide means for clamping the rails to the ties.

While I have described in detail an emare raised bodiment of my invention, I desire to have v edge to prevent spreading and it understood that I do not limit myself to the exact showing and that modifications and changes may be made without departing from the spirit of my invention and within the scope of the appended claims.

Having described my invention, what I claim is 1. A concrete railroad tie comprising two rail supporting portions having hollowed out undersides, and metal reinforced bottom, a concrete brace connecting the supporting portions and integral therewith.

2. A concrete railroad tie comprising two cupped rail supporting portions having the hollowed portions extending downwardly in the cupped portions each being provided with a ring reinforcement at the lower outer a ring reinforcement at the rail supporting surface and an integral concrete brace connecting the two cupped portions.

3. A concrete railroad tie comprising two cupped rail supporting portions having the hollowed portions extending downwardly, the cupped portions each being provided with a ring reinforcement at the lower outer edge to prevent spreading and a ring reinforcement at the rail supporting surface, and an integral concrete brace connecting the two cupped portions, the brace being of T cross section having the cross portion at the top and the web por tion substantially in the plane of the axes of the cupped portions.

In testimony whereof I have aflixed my signature.

ROLF KARL OSKAR SAHLBERG. 

